Home > Publications database > The Tensile Properties of Alloys 800H and 617 in the Range 20 to 950 °C |
Report | FZJ-2016-05697 |
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1990
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
Please use a persistent id in citations: http://hdl.handle.net/2128/12566
Report No.: Juel-2344
Abstract: The tensile properties of Alloy 800H and Alloy 617 in the solution treated condition and after ageing or carburization have been determined for the temperature range 20 to 950 °C. It was found that ageing at 900 °C prior to testing led to an increase in strength and a decrease in ductility at test temperatures up to 700 °C. Above 700 °C, there was no ignificant difference between the tensile properties of solution treated and aged material. Carburization caused a severe loss of ductility in both alloys at temperatures of 20 to around 800 °C, but the ductility increased sharply at test temperatures above 800 °C, accompanied by a change in the fracture mode from fracture of the carbide particles themselves to void formation and separation at the carbide/matrix interface. The correlation between tensile properties and creep data was investigated in tests carried out at different strain rates. Reasonable agreement was found at 800 to 950 °C for Alloy 617 and at 800 to 900 °C for Alloy 800H. Strain ageing effects were observed in both alloys at some temperatures and strain rates ; these effects were serrated flow, negative strain rate sensitivity, peaks in the normalized UTS-temperature curves and plateaus in the elongationtemperature curves. The experimental results were interpreted in the light of two current models for strain ageing, the dislocation-dislocation interaction model and the dislocationsolute interaction model.
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